Refrigerant compositions including 1,1,2-trifluoroethane and hexafluoropropane

ABSTRACT

Refrigerant compositions include mixtures of 1,1,2-trifluoroethane and a second component wherein the second component is (CF3)2NF, (CF3)3N, N(CHF2)2(CF3), N(CH2F)(CF3)2, SF5CF2H5, SF5C2F5, HFC-236ca, HFC-236cb, HFC-236ea, HFC-254cb, HFC-254eb, HFC-263fb, HFC-272ca, HFC-281ea, HFC-281fa, HFC-338mf, HFC-4310mee, butane, cyclopropane, isobutane or propane. Except for FIG. 7, the invention also relates to azeotropic or azeotrope-like compositions which comprise admixtures of effective amounts of 1,1,2-trifluoroethane and (CF3)2NF, (CF3)3N, N(CHF2)2(CF3), N(CH2F)(CF3)2, SF5CF2H, SF5C2F5, HFC-236ca, HFC-236cb, HFC-236ea, HFC-254cb, HFC-254eb, HFC-263fb, HFC-272ca, HFC-281ea, HFC-281fa, HFC-338mf, HFC-4310mee, butane, cyclopropane, isobutane or propane to form an azeotropic or azeotrope-like composition.

CROSS-REFERENCE TO EARLIER FILED APPLICATION

This application is a continuation-in-part of application Ser. No.07/980,320 filed Nov. 19, 1992, abandoned.

FIELD OF THE INVENTION

This invention relates to refrigerant compositions that include1,1,2-trifluoroethane as a component, said compositions being useful ascleaning agents, expansion agents for polyolefins and polyurethanes,aerosol propellants, refrigerants, heat transfer media, gaseousdielectrics, fire extinguishing agents, power cycle working fluids,polymerization media, particulate removal fluids, carrier fluids,buffing abrasive agents, and displacement drying agents.

BACKGROUND OF THE INVENTION

Fluorinated hydrocarbons have many uses, one of which is as arefrigerant. Such refrigerants include dichlorodifluoromethane (CFC-12)and chlorodifluoromethane (HCFC-22).

In recent years it has been pointed out that certain kinds offluorinated hydrocarbon refrigerants released into the atmosphere mayadversely affect the stratospheric ozone layer. Although thisproposition has not yet been completely established, there is a movementtoward the control of the use and the production of certainchlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) under aninternational agreement.

Accordingly, there is a demand for the development of refrigerants thathave a lower ozone depletion potential than existing refrigerants whilestill achieving an acceptable performance in refrigeration applications.Hydrofluorocarbons (HFCs) have been suggested as replacements for CFCsand HCFCs since HFCs have no chlorine and therefore have zero ozonedepletion potential.

In refrigeration applications, a refrigerant is often lost duringoperation through leaks in shaft seals, hose connections, solderedjoints and broken lines. In addition, the refrigerant may be released tothe atmosphere during maintenance procedures on refrigeration equipment.If the refrigerant is not a pure component or an azeotropic orazeotrope-like composition, the refrigerant composition may change whenleaked or discharged to the atmosphere from the refrigeration equipment,which may cause the refrigerant to become flammable or to have poorrefrigeration performance.

Accordingly, it is desirable to use as a refrigerant a singlefluorinated hydrocarbon or an azeotropic or azeotrope-like compositionthat includes one or more fluorinated hydrocarbons.

Fluorinated hydrocarbons may also be used as a cleaning agent or solventto clean, for example, electronic circuit boards. It is desirable thatthe cleaning agents be azeotropic or azeotrope-like because in vapordegreasing operations the cleaning agent is generally redistilled andreused for final rinse cleaning.

Azeotropic or azeotrope-like compositions that include a fluorinatedhydrocarbon are also useful as blowing agents in the manufacture ofclosed-cell polyurethane, phenolic and thermoplastic foams, aspropellants in aerosols, as heat transfer media, gaseous dielectrics,fire extinguishing agents, power cycle working fluids, such as for heatpumps, inert media for polymerization reactions, fluids for removingparticulates from metal surfaces, as carrier fluids that may be used,for example, to place a fine film of lubricant on metal parts, or asbuffing abrasive agents to remove buffing abrasive compounds frompolished surfaces such as metal, as displacement drying agents forremoving water, such as from jewelry or metal parts, as resistdevelopers in conventional circuit manufacturing techniques includingchlorine-type developing agents, and as strippers for photoresists whenused with, for example, a chlorohydrocarbon such as1,1,1-trichloroethane or trichloroethylene.

SUMMARY OF THE INVENTION

The present invention relates to the discovery of compositions of1,1,2-trifluoroethane and bis (trifluoromethyl) fluoroamine,tris(trifluoromethyl)amine, bis (difluoromethyl) trifluoromethylamine,fluoromethylbis (trifluoromethyl) amine, difluoromethyl sulfurpentafluoride, pentafluoroethyl sulfur pentafluoride,1,1,2,2,3,3-hexafluoropropane, 1,1,1,2,2,3-hexafluoropropane,1,1,2,3,3,3-hexafluoropropane, 1,1,2,2-tetrafluoropropane,1,1,1,2-tetrafluoropropane, 1,1,1-trifluoropropane, 2,2-difluoropropane,2-fluoropropane, 1-fluoropropane, 1,1,1,3,3,4,4,4-octafluorobutane,1,1,1,2,3,4,4,5,5,5-decafluoropentane, butane, cyclopropane, isobutane,or propane, said compositions being useful as cleaning agents, expansionagents for polyolefins and polyurethanes, aerosol propellants,refrigerants, heat transfer media, gaseous dielectrics, fireextinguishing agents, power cycle working fluids, polymerization media,particulate removal fluids, carrier fluids, buffing abrasive agents, anddisplacement drying agents. Further, the invention relates to thediscovery of binary azeotropic or azeotrope-like compositions comprisingeffective amounts of 1,1,2-trifluoroethane and bis (trifluoromethyl)fluoroamine, tris(trifluoromethyl)amine, bis (difluoromethyl)trifluoromethylamine, fluoromethylbis (trifluoromethyl) amine,difluoromethyl sulfur pentafluoride, pentafluoroethyl sulfurpentafluoride, 1,1,2,2,3,3-hexafluoropropane,1,1,1,2,2,3-hexafluoropropane, 1,1,2,3,3,3-hexafluoropropane,1,1,2,2-tetrafluoropropane, 1,1,1,2-tetrafluoropropane,1,1,1-trifluoropropane, 2,2-difluoropropane, 2-fluoropropane,1-fluoropropane, 1,1,1,3,3,4,4,4-octafluorobutane,1,1,1,2,3,4,4,5,5,5-decafluoropentane, butane, cyclopropane, isobutane,or propane to form an azeotropic or azeotrope-like composition.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a graph of the vapor/liquid equilibrium curve for mixtures ofHFC-143 and (CF₃)₂ NF at 25° C.;

FIG. 2 is a graph of the vapor/liquid equilibrium curve for mixtures ofHFC-143 and (CF₃)₃ N at 25° C.;

FIG. 3 is a graph of the vapor/liquid equilibrium curve for mixtures ofHFC-143 and N(CHF₂)₂ (CF₃) at 25° C.;

FIG. 4 is a graph of the vapor/liquid equilibrium curve for mixtures ofHFC-143 and N(CH₂ F)(CF₃)₂ at 25° C.;

FIG. 5 is a graph of the vapor/liquid equilibrium curve for mixtures ofHFC-143 and SF₅ CF₂ H at 25° C.;

FIG. 6 is a graph of the vapor/liquid equilibrium curve for mixtures ofHFC-143 and SF₅ C₂ F₅ at 25° C.;

FIG. 7 is a graph of the vapor/liquid equilibrium curve for mixtures ofHFC-143 and HFC-236ca at 25° C.;

FIG. 8 is a graph of the vapor/liquid equilibrium curve for mixtures ofHFC-143 and HFC-236cb at 25° C.;

FIG. 9 is a graph of the vapor/liquid equilibrium curve for mixtures ofHFC-143 and HFC-254cb at 25° C.;

FIG. 10 is a graph of the vapor/liquid equilibrium curve for mixtures ofHFC-143 and HFC-254eb at 25° C.;

FIG. 11 is a graph of the vapor/liquid equilibrium curve for mixtures ofHFC-143 and HFC-263fb at 25° C.;

FIG. 12 is a graph of the vapor/liquid equilibrium curve for mixtures ofHFC-143 and HFC-272ca at 25° C.;

FIG. 13 is a graph of the vapor/liquid equilibrium curve for mixtures ofHFC-143 and HFC-281ea at 25° C.;

FIG. 14 is a graph of the vapor/liquid equilibrium curve for mixtures ofHFC-143 and HFC-281fa at 25° C.;

FIG. 15 is a graph of the vapor/liquid equilibrium curve for mixtures ofHFC-143 and 4310mee at 25° C.;

FIG. 16 is a graph of the vapor/liquid equilibrium curve for mixtures ofHFC-143 and butane at 25° C.;

FIG. 17 is a graph of the vapor/l/quid equilibrium curve for mixtures ofHFC-143 and cyclopropane at 25° C.;

FIG. 18 is a graph of the vapor/liquid equilibrium curve for mixtures ofHFC-143 and isobutane at 25° C.;

FIG. 19 is a graph of the vapor/liquid equilibrium curve for mixtures ofHFC-143 and propane at 25° C.; and

FIG. 20 is a graph of the vapor/liquid equilibrium curve for mixtures ofHFC-143 and HFC-236ea at 18.43° C.

DETAILED DESCRIPTION

The present invention relates to compositions of 1,1,2-trifluoroethane(HFC-143, or CHF₂ CH₂ F, boiling point=4° C.), and at least one of thefollowing components:

1. Bis (trifluoromethyl) fluoroamine ((CF₃)₂ NF, boiling point=-40° to-35° C.)

2. tris(trifluoromethyl)amine ((CF₃)₃ NF, boiling point=-6.5° C.),

3. Bis (difluoromethyl) trifluoromethylamine (N(CHF₂)₂ (CF₃), boilingpoint=26.5° C.),

4. Fluoromethylbis (trifluoromethyl) amine (N(CH₂ F)(CF₃)₂, boilingpoint=26° C.),

5. difluoromethyl sulfur pentafluoride (SF₅ CF₂ H, boiling point=5.1°C.),

6. pentafluoroethyl sulfur pentafluoride (SF₅ C₂ F₅, boiling point=13.5°C.),

7. 1,1,2,2,3,3-hexafluoropropane (HFC-236ca, or CHF₂ CF₂ CHF₂)

8. 1,1,1,2,2,3-hexafluoropropane (HFC-236cb, or CF₃ CF₂ CH₂ F)

9. 1,1,2,3,3,3-hexafluoropropane (HFC-236ea, or CHF₂ CHFCF₃)

10. 1,1,2,2-tetrafluoropropane (HFC-254cb, or CHF2CF₂ CH₃)

11. 1,1,1,2-tetrafluoropropane (HFC-254eb, or CF₃ CFHCH₃)

12. 1,1,1-trifluoropropane (HFC-263fb, or CF₃ CH₂ CH₃)

13. 2,2-difluoropropane (HFC-272ca, or CH₃ CF₂ CH₃)

14. 2-fluoropropane (HFC-281ea, or CH₃ CHFCH₃)

15. 1-fluoropropane (HFC-281fa, or CH₂ FCH₂ CH₃)

16. 1,1,1,3,3,4,4,4-octafluorobutane (HFC-338mf, or CF₃ CH₂ CF₂ CF₃)

17. 1,1,1,2,3,4,4,5,5,5-decafluoropentane (HFC-4310mee, or CF₃ CFHCFHCF₂CF₃),

18. butane (C₄ H₁₀)

19. cyclopropane (cC₃ H₆)

20. isobutane (CH(CH₃)₃)

21. propane (C₃ H₈)

(CF₃)₃ N (CAS Reg. No. 432-03-1) has been made by electrochemicalfluorination of trimethyl amine in anhydrous hydrogen fluoride asdisclosed by Kauck and Simons in U.S. Pat. No. 2,616,927.

N(CHF₂)₂ (CF₃) (CAS Reg. No. 73551-02-7) has been prepared byfluorination of trimethyl amine over cobalt trifluoride as reported byRendell and Wright in Tetrahedron, Vol. 35, pp. 2405-2411 (1979).

N(CH₂ F)(CF₃)₂ (CAS Reg. No. 67212-88-8) has been prepared byfluorination of 4-methylmorpholine as reported by Rendell and Wright inTetrahedron, Vol. 34, pp. 197-203 (1978).

SF₅ CF₂ H (CAS Reg. No. 420-67-7) has been prepared by reaction ofmethyl mercaptan with fluorine gas as disclosed by Silvey and Cady inU.S. Pat. No. 2,697,726 and J. Am. Chem. Soc., Vol. 72, pages 3624-26(1950).

SF₅ C₂ F₅ (CAS Reg. No. 354-67-6) has been prepared by electrochemicalfluorination of ethyl sulfide in anhydrous hydrogen fluoride as reportedby Dresdner in J. Am. Chem. Soc., Vol. 79, pages 69-70 (1957).

The following compositions can be used as refrigerants: 1-99 weightpercent HFC-143 and 1-99 weight percent of (CF₃)₂ NF, (CF₃)₃ N, N(CHF₂)₂(CF₃), N(CH₂ F)(CF₃)₂, SF₅ CF₂ H, SF₅ C₂ F₅, HFC-236ca, HFC-236cb,HFC-236ea, HFC-254cb, HFC-254eb, HFC-263fb, HFC-272ca, HFC-281ea,HFC-281fa, HFC-338mf, HFC-4310mee, butane, cyclopropane, isobutane, orpropane.

The present invention also relates to the discovery of azeotropic orazeotrope-like compositions of effective amounts of HFC-143 and a secondcomponent to form an azeotropic or azeotrope-like composition, whereinthe second component is (CF₃)₂ NF, (CF₃)₃ N, N(CHF₂)₂ (CF₃), N(CH₂F)(CF₃)₂, SF₅ CF₂ H, SF₅ C₂ F₅, HFC-236ca, HFC-236cb, HFC-236ea,HFC-254cb, HFC-254eb, HFC-263fb, HFC-272ca, HFC-281ea, HFC-281fa,HFC-338mf, HFC-4310mee, butane, cyclopropane, isobutane or propane.

By "azeotropic" composition is meant a constant boiling liquid admixtureof two or more substances that behaves as a single substance. One way tocharacterize an azeotropic composition is that the vapor produced bypartial evaporation or distillation of the liquid has the samecomposition as the liquid from which it was evaporated or distilled,that is, the admixture distills/refluxes without compositional change.Constant boiling compositions are characterized as azeotropic becausethey exhibit either a maximum or minimum boiling point, as compared withthat of the non-azeotropic mixtures of the same components.

By "azeotrope-like" composition is meant a constant boiling, orsubstantially constant boiling, liquid admixture of two or moresubstances that behaves as a single substance. One way to characterizean azeotrope-like composition is that the vapor produced by partialevaporation or distillation of the liquid has substantially the samecomposition as the liquid from which it was evaporated or distilled,that is, the admixture distills/refluxes without substantial compositionchange.

It is recognized in the art that a composition is azeotrope-like if,after 50 weight percent of the composition is removed such as byevaporation or boiling off, the difference in vapor pressure between theoriginal composition and the composition remaining after 50 weightpercent of the original composition has been removed is less than 10percent, when measured in absolute units. By absolute units, it is meantmeasurements of pressure and, for example, psia, atmospheres, bars,torr, dynes per square centimeter, millimeters of mercury, inches ofwater and other equivalent terms well known in the art. If an azeotropeis present, there is no difference in vapor pressure between theoriginal composition and the composition remaining after 50 weightpercent of the original composition has been removed.

Therefore, included in this invention are compositions of effectiveamounts of HFC-143 and a second component, wherein the second componentis (CF₃)₂ NF, (CF₃)₃ N, N(CHF₂)₂ (CF₃), N(CH₂ F)(CF₃)₂, SF₅ CF₂ H, SF₅C₂ F₅, HFC-236ca, HFC236cb, HFC-236ea, HFC-254cb, HFC254eb, HFC263fb,HFC-272ca, HFC281ea, HFC-281fa, HFC-338mf, HFC-4310mee, butane,cyclopropane, isobutane or propane such that after 50 weight percent ofan original composition is evaporated or boiled off to produce aremaining composition, the difference in the vapor pressure between theoriginal composition and the remaining composition is 10 percent orless.

For compositions that are azeotropic, there is usually some range ofcompositions around the azeotrope point that, for a maximum boilingazeotrope, have boiling points at a particular pressure higher than thepure components of the composition at that pressure and have vaporpressures at a particular temperature lower than the pure components ofthe composition at that temperature, and that, for a minimum boilingazeotrope, have boiling points at a particular pressure lower than thepure components of the composition at that pressure and have vaporpressures at a particular temperature higher than the pure components ofthe composition at that temperature. Boiling temperatures and vaporpressures above or below that of the pure components are caused byunexpected intermolecular forces between and among the molecules of thecompositions, which can be a combination of repulsive and attractiveforces such as van der Waals forces and hydrogen bonding.

The range of compositions that have a maximum or minimum boiling pointat a particular pressure, or a maximum or minimum vapor pressure at aparticular temperature, may or may not be coextensive with the range ofcompositions that have a change in vapor pressure of less than about 10%when 50 weight percent of the composition is evaporated. In those caseswhere the range of compositions that have maximum or minimum boilingtemperatures at a particular pressure, or maximum or minimum vaporpressures at a particular temperature, are broader than the range ofcompositions that have a change in vapor pressure of less than about 10%when 50 weight percent of the composition is evaporated, the unexpectedintermolecular forces are nonetheless believed important in that therefrigerant compositions having those forces that are not substantiallyconstant boiling may exhibit unexpected increases in the capacity orefficiency versus the components of the refrigerant composition.

The components of the compositions of this invention have the followingvapor pressures at 25° C.

    ______________________________________                                        COMPONENTS        PSIA    KPA                                                 ______________________________________                                        HFC-143           33.1    228                                                 (CF.sub.3).sub.2 NF                                                                             132.9   917                                                 (CF.sub.3).sub.3 N                                                                              45.8    316                                                 N(CHF.sub.2).sub.2 (CF.sub.3)                                                                   13.9    96                                                  N(CH.sub.2 F)(CF.sub.3).sub.2                                                                   14.2    98                                                  SF.sub.5 CF.sub.2 H                                                                             31.3    216                                                 SF.sub.5 C.sub.2 F.sub.5                                                                        22.8    157                                                 HFC-236ca         24.9    172                                                 HFC-236cb         33.6    232                                                 HFC-236ea         29.8    206                                                 HFC-254cb         34.2    236                                                 HFC-254eb         34.8    240                                                 HFC-263fb         54.0    372                                                 HFC-272ca         34.5    238                                                 HFC-281ea         47.1    325                                                 HFC-281fa         37.7    260                                                 HFC-338mf         18.8    130                                                 HFC-4310mee       4.4     30                                                  butane            35.2    243                                                 cyclopropane      105.0   724                                                 isobutane         50.5    348                                                 propane           137.8   950                                                 ______________________________________                                    

Substantially constant boiling, azeotropic or azeotrope-likecompositions of this invention comprise the following (all compositionsare measured at 25° C.):

    ______________________________________                                                       WEIGHT                                                                        RANGES       PREFERRED                                         COMPONENTS     (wt. %/wt. %)                                                                              (wt. %/wt. %)                                     ______________________________________                                        HFC-143/(CF.sub.3).sub.2 NF                                                                   1-42/58-99  --                                                HFC-143/(CF.sub.3).sub.3 N                                                                   11-50/50-89  --                                                HFC-143/N(CHF.sub.2).sub.2 (CF.sub.3)                                                        34-99/1-66   34-80/20-66                                       HFC-143/N(CH.sub.2 F)(CF.sub.3).sub.2                                                        34-99/1-66   34-80/20-66                                       HFC-143/SF.sub.5 CF.sub.2 H                                                                   1-99/1-99    1-60/40-99                                       HFC-143/SF.sub.5 C.sub.2 F.sub.5                                                             19-66/34-81  --                                                HFC-143/HFC-236ca                                                                             1-99/1-99    1-70/30-99                                       HFC-143/HFC-236cb                                                                             1-99/1-99    1-70/30-99                                       HFC-143/HFC-236ea                                                                             1-99/1-99   30-99/1-70                                        HFC-143/HFC-254cb                                                                             1-99/1-99    1-70/30-99                                       HFC-143/HFC-254eb                                                                             1-99/1-99    1-70/30-99                                       HFC-143/HFC-263fb                                                                             1-99/1-99    1-70/30-99                                       HFC-143/HFC-272ca                                                                             1-99/1-99   20-80/20-80                                       HFC-143/HFC-281ea                                                                             1-99/1-99    1-70/30-99                                       HFC-143/HFC-281fa                                                                             1-99/1-99   10-70/30-90                                       HFC-143/HFC-338mf                                                                             1-99/1-99    1-80/20-99                                       HFC-143/4310mee                                                                              47-99/1-53   60-99/1-40                                        HFC-143/butane 28-78/22-72  40-70/30-60                                       HFC-143/cyclopropane                                                                          1-56/44-99  10-50/50-90                                       HFC-143/isobutane                                                                            18-69/31-82  20-60/40-80                                       HFC-143/propane                                                                               1-54/46-99  10-50/50-90                                       ______________________________________                                    

For purposes of this invention, "effective amount" is defined as theamount of each component of the inventive compositions which, whencombined, results in the formation of an azeotropic or azeotrope-likecomposition. This definition includes the amounts of each component,which amounts may vary depending on the pressure applied to thecomposition so long as the azeotropic or azeotrope-like compositionscontinue to exist at the different pressures, but with possibledifferent boiling points.

Therefore, effective amount includes the amounts, such as may beexpressed in weight percentages, of each component of the compositionsof the instant invention which form azeotropic or azeotrope-likecompositions at temperatures or pressures other than as describedherein.

For the purposes of this discussion, azeotropic or constant-boiling isintended to mean also essentially azeotropic or essentially-constantboiling. In other words, included within the meaning of these terms arenot only the true azeotropes described above, but also othercompositions containing the same components in different proportions,which are true azeotropes at other temperatures and pressures, as wellas those equivalent compositions which are part of the same azeotropicsystem and are azeotrope-like in their properties. As is well recognizedin this art, there is a range of compositions which contain the samecomponents as the azeotrope, which will not only exhibit essentiallyequivalent properties for refrigeration and other applications, butwhich will also exhibit essentially equivalent properties to the trueazeotropic composition in terms of constant boiling characteristics ortendency not to segregate or fractionate on boiling.

It is possible to characterize, in effect, a constant boiling admixturewhich may appear under many guises, depending upon the conditionschosen, by any of several criteria:

The composition can be defined as an azeotrope of A, B, C (and D . . . )since the very term "azeotrope" is at once both definitive andlimitative, and requires that effective amounts of A, B, C (and D . . .) for this unique composition of matter which is a constant boilingcomposition.

It is well known by those skilled in the art, that, at differentpressures, the composition of a given azeotrope will vary at least tosome degree, and changes in pressure will also change, at least to somedegree, the boiling point temperature. Thus, an azeotrope of A, B, C(and D . . . ) represents a unique type of relationship but with avariable composition which depends on temperature and/or pressure.Therefore, compositional ranges, rather than fixed compositions, areoften used to define azeotropes.

The composition can be defined as a particular weight percentrelationship or mole percent relationship of A, B, C (and D . . . ),while recognizing that such specific values point out only oneparticular relationship and that in actuality, a series of suchrelationships, represented by A, B, C (and D . . . ) actually exist fora given azeotrope, varied by the influence of pressure.

An azeotrope of A, B, C (and D . . . ) can be characterized by definingthe compositions as an azeotrope characterized by a boiling point at agiven pressure, thus giving identifying characteristics without undulylimiting the scope of the invention by a specific numerical composition,which is limited by and is only as accurate as the analytical equipmentavailable.

The azeotropic and azeotrope-like compositions of the present inventioncan be prepared by any convenient method including mixing or combiningthe desired amounts. A preferred method is to weigh the desiredcomponent amounts and thereafter combine them in an appropriatecontainer.

Specific examples illustrating the invention are given below. Unlessotherwise stated therein, all percentages are by weight. It is to beunderstood that these examples are merely illustrative and in no way areto be interpreted as limiting the scope of the invention.

EXAMPLE 1 Phase Study

A phase study shows the following compositions are azeotropes, all at25° C.

    __________________________________________________________________________    Composition                    Vapor Press.                                   No.                            psia (kPa)                                     __________________________________________________________________________     1.     10.6 wt. % HFC-143 89.4 wt. % (CF.sub.3).sub.2 NF                                                    148.9                                           2.     24.1 wt. % HFC-143 75.9 wt. % (CF.sub.3).sub.3 N                                                     70.2                                            3.     66.3 wt. % HFC-143 33.7 wt. % N(CHF.sub.2).sub.2 (CF.sub.3)                                          37.2                                            4.     66.6 wt. % HFC-143 33.4 wt. % N(CH.sub.2 F)(CF.sub.3).sub.2                                          36.8                                            5.     40.2 wt. % HFC-143 59.8 wt. % SF.sub.5 CF.sub.2 H                                                    40.3                                            6.     42.1 wt. % HFC-143 57.9 wt. % SF.sub.5 C.sub.2 F.sub.5                                               44.5                                            7.      2.0 wt. % HFC-143 98.0 wt. % HFC-236ca                                                              25.0                                            8.     29.6 wt. % HFC-143 70.4 wt. % HFC-236cb                                                              27.7                                            9.     78.1 wt. % HFC-143 21.9 wt. % HFC-236ea                                                              33.3                                           10.     51.6 wt. % HFC-143 48.4 wt. % HFC-254cb                                                              32.1                                           11.     44.6 wt. % HFC-143 55.4 wt. % HFC-254eb                                                              31.4                                           12.      9.7 wt. % HFC-143 90.3 wt. % HFC-263fb                                                              56.2                                           13.     36.0 wt. % HFC-143 64.0 wt. % HFC-272ca                                                              41.2                                           14.     18.4 wt. % HFC-143 81.6 wt. % HFC-281ea                                                              47.5                                           15.     44.6 wt. % HFC-143 55.4 wt. % HFC-281fa                                                              39.4                                           16.      1.7 wt. % HFC-143 98.3 wt. % HFC-338mf                                                              19.3                                           17.     95.5 wt. % HFC-143 4.5 wt. % 4310mee                                                                 33.2                                           18.     53.2 wt. % HFC-143 46.8 wt. % butane                                                                 52.2                                           19.     21.5 wt. % HFC-143 78.5 wt. % cyclopropane                                                           112.1                                          20.     41.8 wt. % HFC-143 58.2 wt. % isobutane                                                              65.1                                           21.     16.3 wt. % HFC-143 83.7 wt. % propane                                                                142.8                                          __________________________________________________________________________

EXAMPLE 2 Impact of Vapor Leakage on Vapor Pressure at 25° C.

A vessel is charged with an initial composition at 25° C., and the vaporpressure of the composition is measured. The composition is allowed toleak from the vessel, while the temperature is held constant at 25° C.,until 50 weight percent of the initial composition is removed, at whichtime the vapor pressure of the composition remaining in the vessel ismeasured. The results are summarized below.

    __________________________________________________________________________    Refrigerant  0 wt % evaporated                                                                       50 wt % evaporated                                                                      0% change in                                 Composition  psia (kPa)                                                                              psia (kPa)                                                                              vapor pressure                               __________________________________________________________________________    HFC-143/(CF.sub.3).sub.2 NF                                                    1.0/99.0    138.8     134.3     3.2                                          10.6/89.4    148.9     148.9     0.0                                          30.0/70.0    146.9     145.3     1.1                                          35.0/65.0    146.5     144.7     1.2                                          40.0/60.0    146.1     143.8     1.6                                          42.0/58.0    146.0     141.3     3.2                                          43.0/57.0    145.9     129.0     11.6                                         HFC-143/(CF.sub.3).sub.3 N                                                    10.0/90.0    68.8      60.8      11.6                                         11.0/89.0    69.1      63.2      8.5                                          12.0/88.0    69.3      65.0      6.2                                          24.1/75.9    70.2      70.2      0.0                                          40.0/60.0    69.9      69.6      0.4                                          45.0/55.0    69.8      69.3      0.7                                          50.0150.0    69.7      67.7      2.9                                          51.0/49.0    69.7      59.8      14.2                                         HFC-143/N(CHF.sub.2).sub.2 (CF.sub.3)                                         34.0/66.0    35.8      32.3      9.8                                          35.0/65.0    35.9      32.7      8.9                                          40.0/60.0    36.3      34.5      5.0                                          50.0/50.0    36.9      36.4      1.4                                          66.3/33.7    37.2      37.2      0.0                                          80.0/20.0    36.9      36.3      1.6                                          90.0/10.0    36.1      34.2      5.3                                          99.0/1.0     33.6      33.1      1.5                                          HFC-143/N(CH.sub.2 F)(CF.sub.3).sub.2                                         33.0/67.0    35.2      31.5      10.5                                         34.0/66.0    35.3      32.0      9.3                                          35.0/65.0    35.4      32.4      8.5                                          40.0/60.0    35.9      34.1      5.0                                          66.6/33.4    36.8      36.8      0.0                                          80.0/20.0    36.5      36.0      1.4                                          90.0/10.0    35.7      34.3      3.9                                          99.0/1.0     33.5      33.2      0.9                                          HFC-143/SF.sub.5 CF.sub.2 H                                                    1.0/99.0    32.1      31.7      1.2                                           5.0/95.0    34.5      33.2      3.8                                          10.0/90.0    36.7      35.1      4.4                                          20.0/80.0    39.0      38.2      2.1                                          40.2/59.8    40.3      40.3      0.0                                          60.0/40.0    39.6      39.0      1.5                                          80.0/20.0    37.5      35.7      4.8                                          90.0/10.0    35.7      34.1      4.5                                          99.0/1.0     33.4      33.2      0.6                                          HFC-143/SF.sub.5 C.sub.2 F.sub.5                                              17.0/83.0    42.5      37.1      12.7                                         19.0/81.0    43.0      38.9      9.5                                          20.0/80.0    43.2      39.6      8.3                                          42.1/57.9    44.5      44.5      0.0                                          60.0/40.0    44.2      43.1      2.5                                          66.0/34.0    44.0      40.3      8.4                                          67.0/33.0    44.0      39.6      10.0                                         70.0/30.0    43.8      36.9      15.7                                         HFC-143/HFC-236ca                                                              1.0/99.0    25.0      25.0      0.0                                           2.0/98.0    25.0      25.0      0.0                                          10.0/90.0    24.9      24.9      0.0                                          20.0/80.0    25.1      25.1      0.0                                          30.0/70.0    25.9      25.6      1.2                                          40.0/60.0    27.0      26.4      2.2                                          50.0150.0    28.1      27.3      2.8                                          60.0/40.0    29.2      28.4      2.7                                          70.0/30.0    30.3      29.6      2.3                                          80.0/20.0    31.3      30.8      1.6                                          90.0/10.0    32.2      31.9      0.9                                          99.0/1.0     33.0      33.0      0.0                                          HFC-143/HFC-236cb                                                              1.0/99.0    33.3      33.2      0.3                                          10.0/90.0    30.3      29.4      3.0                                          20.0/80.0    28.2      28.0      0.7                                          29.6/70.4    27.7      27.7      0.0                                          40.0/60.0    28.0      27.9      0.4                                          50.0150.0    28.8      28.4      1.4                                          60.0/40.0    29.7      29.2      1.7                                          70.0/30.0    30.6      30.1      1.6                                          80.0/20.0    31.5      31.1      1.3                                          90.0/10.0    32.3      32.1      0.6                                          99.0/1.0     33.0      33.0      0.0                                          HFC-143/HFC-236ea                                                              1.0/99.0    30.0 (207)                                                                              29.9 (206)                                                                              0.3                                          20.0/80.0    31.6 (218)                                                                              31.5 (217)                                                                              0.3                                          40.0/60.0    32.6 (225)                                                                              32.6 (225)                                                                              0.0                                          60.0/40.0    33.1 (228)                                                                              33.1 (228)                                                                              0.0                                          78.1/21.9    33.3 (230)                                                                              33.3 (230)                                                                              0.0                                          99.0/1.0     33.1      33.1      0.0                                          HFC-143/HFC-254cb                                                              1.0/99.0    34.1      34.1      0.0                                          10.0/90.0    33.6      33.6      0.0                                          30.0/70.0    32.5      32.4      0.3                                          51.6/48.4    32.1      32.1      0.0                                          70.0/30.0    32.3      32.3      0.0                                          90.0/10.0    32.8      32.8      0.0                                          99.0/1.0     33.1      33.1      0.0                                          HFC-143/HFC-254eb                                                              1.0/99.0    34.6      34.5      0.3                                          10.0/90.0    33.3      33.1      0.6                                          30.0/70.0    31.7      31.6      0.3                                          44.6/55.4    31.4      31.4      0.0                                          70.0/30.0    31.9      31.9      0.0                                          90.0/10.0    32.7      32.6      0.3                                          99.0/1.0     33.1      33.1      0.0                                          HFC-143/HFC-263fb                                                              1.0/99.0    54.7      54.4      0.5                                           9.7/90.3    56.2      56.2      0.0                                          20.0/80.0    55.5      54.9      1.1                                          30.0/70.0    53.9      52.2      3.2                                          40.0/60.0    51.6      48.8      5.4                                          50.0/50.0    49.0      45.3      7.5                                          60.0/40.0    46.0      42.1      8.5                                          70.0/30.0    42.8      39.2      8.4                                          80.0/20.0    39.6      36.8      7.1                                          90.0/10.0    36.3      34.7      4.4                                          99.0/1.0     33.4      33.2      0.6                                          HFC-143/HFC-272ca                                                              1.0/99.0    35.4      34.6      2.3                                          10.0/90.0    39.3      37.4      4.8                                          20.0/80.0    40.6      40.1      1.2                                          36.0/64.0    41.2      41.2      0.0                                          60.0/40.0    40.1      39.5      1.5                                          80.0/20.0    37.3      36.4      2.4                                          90.0/10.0    35.4      34.7      2.0                                          99.0/1.0     33.3      33.3      0.0                                          HFC-143/HFC-281ea                                                              1.0/99.0    47.2      47.2      0.0                                          10.0/90.0    47.4      47.4      0.0                                          18.4/81.6    47.5      47.5      0.0                                          30.0/70.0    47.3      47.3      0.0                                          50.0150.0    46.3      45.9      0.9                                          70.0/30.0    43.9      42.4      3.4                                          80.0/20.0    41.8      39.6      5.3                                          90.0/10.0    38.6      36.1      6.5                                          99.0/1.0     33.8      33.3      1.5                                          HFC-143/HFC-281fa                                                              1.0/99.0    37.8      37.8      0.0                                          10.0/90.0    38.3      38.3      0.0                                          30.0/70.0    39.2      39.2      0.0                                          44.6/55.4    39.4      39.4      0.0                                          70.0/30.0    38.6      38.3      0.8                                          90.0/10.0    36.0      35.3      1.9                                          99.0/1.0     33.5      33.3      0.6                                          HFC-143/HFC-338mf                                                              1.0/99.0    19.3      19.3      0.0                                           1.7/98.3    19.3      19.3      0.0                                          20.0/80.0    20.5      19.8      3.4                                          40.0/60.0    24.7      22.5      8.9                                          50.0150.0    26.6      24.4      8.3                                          60.0/40.0    28.3      26.3      7.1                                          80.0/20.0    31.0      30.0      3.2                                          99.0/1.0     33.0      33.0      0.0                                          HFC-143/HFC-4310mee                                                           95.5/4.5     33.2      33.2      0.0                                          99.0/1.0     33.1      33.1      0.0                                          60.0/40.0    32.1      30.9      3.7                                          50.0/50.0    31.5      29.0      7.9                                          47.0/53.0    31.2      28.2      9.6                                          46.0/54.0    31.1      27.8      10.6                                         HFC-143/butane                                                                25.0/75.0    50.6      43.7      13.6                                         27.0/73.0    50.9      45.4      10.8                                         28.0/72.0    51.0      46.2      9.4                                          30.0/70.0    51.2      47.6      7.0                                          40.0/60.0    51.9      51.2      1.3                                          53.2/46.8    52.2      52.2      0.0                                          70.0/30.0    51.5      49.8      3.3                                          78.0/22.0    50.2      45.6      9.2                                          79.0/21.0    49.9      44.8      10.2                                         80.0/20.0    49.7      44.1      11.3                                         HFC-143/cyclopropane                                                           1.0/99.0    106.3     105.3     0.9                                          10.0/90.0    111.2     109.5     1.5                                          21.5/78.5    112.1     112.1     0.0                                          40.0/60.0    110.9     108.8     1.9                                          50.0150.0    109.2     103.0     5.7                                          55.0/45.0    107.8     98.2      8.9                                          56.0/44.0    107.5     97.1      9.7                                          57.0/43.0    107.2     95.8      10.6                                         HFC-143/isobutane                                                             10.0/90.0    60.7      52.2      14.0                                         15.0/85.0    62.6      55.0      12.1                                         17.0/83.0    63.1      56.6      10.3                                         18.0/82.0    63.3      57.4      9.3                                          20.0/80.0    63.7      59.0      7.4                                          30.0/70.0    64.8      63.9      1.4                                          41.8/58.2    65.1      65.1      0.0                                          60.0/40.0    64.3      62.4      2.9                                          65.0/35.0    63.7      60.0      5.8                                          69.0/31.0    63.0      57.1      9.4                                          70.0/30.0    62.8      56.2      10.5                                         HFC-143/propane                                                                1.0/99.0    138.7     138.2     0.4                                          10.0/90.0    142.4     141.9     0.3                                          16.3/83.7    142.8     142.8     0.0                                          30.0/70.0    141.8     140.6     0.8                                          40.0/60.0    140.2     136.5     2.6                                          50.0150.0    137.9     128.5     6.8                                          54.0/46.0    136.6     123.2     9.8                                          55.0/45.0    136.2     121.6     10.7                                         __________________________________________________________________________

The results of this Example show that these compositions are azeotropicor azeotrope-like because when 50 wt. % of an original composition isremoved, the vapor pressure of the remaining composition is within about10% of the vapor pressure of the original composition, at a temperatureof 25° C.

EXAMPLE 3 Impact of Vapor Leakage at 0° C.

A leak test is performed on compositions of HFC-143 and (CF₃)₃ N, at atemperature of 0° C. The results are shown below.

    ______________________________________                                                    0 wt %    50 wt %                                                 Refrigerant evaporated                                                                              evaporated                                                                              0% change in                                  Composition psia (kPa)                                                                              psia (kPa)                                                                              vapor pressure                                ______________________________________                                        HFC-143/(CF.sub.3).sub.3 N                                                    21.9/78.1   28.4   196    28.4 196  0.0                                       10.0/90.0   28.0   193    25.7 177  8.2                                        9.0/91.0   27.9   192    24.6 170  11.8                                      48.0/52.0   28.2   194    27.6 190  2.1                                       49.0/51.0   28.2   194    21.1 145  25.2                                      ______________________________________                                    

These results show that compositions of HFC-143 and (CF₃)₃ N areazeotropic or azeotrope-like at different temperatures, but that theweight percents of the components vary as the temperature is changed.

EXAMPLE 4 Refrigerant Performance

The following table shows the performance of various refrigerants. Thedata are based on the following conditions.

Evaporator temperature 40.0° F. (4.4° C.)

Condenser temperature 100.0° F. (37.8° C.)

Compressor efficiency is 75%.

The refrigeration capacity is based on a compressor with a fixeddisplacement of 3.5 cubic feet per minute and 75% volumetric efficiency.Capacity is intended to mean the change in enthalpy of the refrigerantin the evaporator per pound of refrigerant circulated, i.e. the heatremoved by the refrigerant in the evaporator per time. Coefficient ofperformance (COP) is intended to mean the ratio of the capacity tocompressor work. It is a measure of refrigerant energy efficiency.

    __________________________________________________________________________                 Evap. Cond.            Capacity                                  Refrig.      Press.                                                                              Press.                                                                              Comp. Dis. BTU/min                                   Comp.        Psia (kPa)                                                                          Psia (kPa)                                                                          Temp. °F. (°C.)                                                         COP                                                                              (kw)                                      __________________________________________________________________________    CFC-11       7.1(49)                                                                             23.5(162)                                                                           130.0(54.4)                                                                           5.68                                                                             44.2(0.8)                                 HFC-143/(CF.sub.3).sub.2 NF                                                    1.0/99.0    71.5  186.5 102.0   4.41                                                                             250.3                                     10.6/89.4    61.0  166.6 108.2   4.55                                                                             234.9                                     42.0/58.0    32.2  104.9 138.1   4.89                                                                             164.0                                     HFC-143/(CF.sub.3).sub.3 N                                                     5.0/95.0*   24.2  72.7  101.1   4.69                                                                             106.7                                     11.0/89.0*   25.2  74.7  103.7   4.77                                                                             112.1                                     24.1/75.9    25.2  74.1  100.2   5.09                                                                             119.7                                     50.0150.0    20.9  64.0  118.3   5.30                                                                             109.8                                     95.0/5.0     15.3  47.3  134.8   5.65                                                                             88.6                                      *10° F. Superheat                                                      HFC-143/N(CHF.sub.2).sub.2 (CF.sub.3)                                          5.0/95.0    6.7   24.6  102.9   5.39                                                                             41.7                                      34.0/66.0    10.1  34.6  117.0   5.43                                                                             60.3                                      66.3/33.7    12.8  41.3  125.9   5.51                                                                             74.6                                      99.0/1.0     14.4  44.9  135.0   5.60                                                                             83.5                                      HFC-143/N(CH.sub.2 F)(CF.sub.3).sub.2                                          5.0/95.0    7.0   25.1  100.5   5.37                                                                             42.4                                      34.0/66.0    10.6  35.8  114.8   5.40                                                                             62.1                                      66.6/33.4    13.3  42.4  124.0   5.51                                                                             76.6                                      99.0/1.0     14.4  44.9  134.9   5.60                                                                             83.6                                      HFC-143/SF.sub.5 CF.sub.2 H                                                    1.0/99.0    14.3  49.6  112.5   5.38                                                                             84.9                                      40.2/59.8    14.1  46.4  124.0   5.51                                                                             83.4                                      99.0/1.0     14.4  45.0  135.1   5.60                                                                             83.7                                      HFC-143/SF.sub.5 C.sub.2 F.sub.5                                               5.0/95.0*   11.0  39.1  101.4   5.10                                                                             62.2                                      19.0/8.10    12.6  42.7  104.2   5.28                                                                             71.5                                      42.1/57.9    13.8  45.1  114.4   5.43                                                                             79.0                                      66.0/34.0    14.3  45.5  123.7   5.53                                                                             82.5                                      95.0/5.0     14.4  45.1  133.7   5.59                                                                             83.7                                      *5° F. Superheat                                                       HFC-143/HFC-236ca                                                              1.0/99.0    11.8  38.2  104.4   5.36                                                                             65.8                                       2.0/98.0    11.9  38.5  104.9   5.37                                                                             66.4                                      99.0/1.0     14.4  45.0  135.0   5.60                                                                             83.8                                      HFC-143/HFC-236cb                                                              1.0/99.0*   16.6  50.5  104.8   5.17                                                                             83.5                                      29.6/70.4    18.3  54.7  109.5   5.38                                                                             95.3                                      99.0/1.0     14.5  45.2  135.0   5.60                                                                             84.1                                      *5° F. Superheat                                                       HFC-143/HFC-236ea                                                              1.0/99.0    13.8  43.7  103.7   5.32                                                                             74.5                                      78.1/21.9    15.0  46.7  128.7   5.57                                                                             85.6                                      99.0/1.0     14.4  45.1  135.0   5.60                                                                             83.8                                      HFC-143/HFC-254cb                                                              1.0/99.0    16.8  50.5  106.7   5.38                                                                             88.0                                      51.6/48.4    16.5  50.3  120.7   5.50                                                                             90.8                                      99.0/1.0     14.4  45.1  135.1   5.59                                                                             83.8                                      HFC-143/HFC-254eb                                                              1.0/99.0    17.1  51.3  106.6   5.38                                                                             89.3                                      44.6/55.4    16.9  51.1  118.5   5.48                                                                             91.8                                      99.0/1.0     14.4  45.1  135.1   5.59                                                                             83.8                                      HFC-143/HFC-263fb                                                              1.0/99.0    27.6  77.7  106.5   5.28                                                                             132.4                                      9.7/90.3    26.5  75.1  108.9   5.31                                                                             129.0                                     99.0/1.0     14.5  45.3  135.2   5.59                                                                             84.2                                      HFC-143/HFC-272ca                                                              1.0/99.0    17.3  50.2  111.4   5.48                                                                             89.9                                      36.0/64.0    16.8  49.8  118.1   5.52                                                                             90.3                                      99.0/1.0     14.4  45.1  135.0   5.60                                                                             83.8                                      HFC-143/HFC-281ea                                                              1.0/99.0    24.0  67.8  116.9   5.47                                                                             121.5                                     18.4/81.6    22.5  64.4  119.7   5.49                                                                             116.1                                     99.0/1.0     14.5  45.2  135.0   5.61                                                                             84.3                                      HFC-143/HFC-281fa                                                              1.0/99.0    18.7  55.1  117.3   5.50                                                                             99.5                                      44.6/55.4    17.2  51.8  123.5   5.53                                                                             94.4                                      99.0/1.0     14.5  45.1  135.1   5.60                                                                             83.9                                      HFC-143/HFC-338mf                                                              1.0/99.0*   9.1   30.1  99.5    5.01                                                                             47.4                                       1.7/88.3*   9.2   30.7  99.8    5.04                                                                             48.8                                      99.0/1.0     14.5  45.1  134.8   5.61                                                                             84.0                                      *10° F. Superheat                                                      HFC-143/HFC-4310mee                                                           38.0/62.0    7.2   29.4  129.7   4.95                                                                             45.0                                       5.0/.95.0   3.1   13.5  104.1   5.59                                                                             22.6                                      95.5/4.5     14.3  44.8  133.2   5.59                                                                             83.0                                      99.0/1.0     14.4  44.9  134.8   5.60                                                                             83.6                                      HFC-143/butane                                                                 5.0/95.0    17.6  51.5  107.4   5.45                                                                             90.9                                      28.0/72.0    17.2  50.9  111.4   5.45                                                                             90.6                                      53.2/46.8    16.6  49.6  117.2   5.50                                                                             89.5                                      78.0/22.0    15.6  47.6  125.1   5.55                                                                             87.3                                      95.0/5.0     14.7  45.7  132.6   5.59                                                                             84.7                                      HFC-143/cyclopropane                                                           1.0/99.0    56.9  144.1 142.9   5.45                                                                             262.3                                     21.5/78.5    46.9  125.1 148.5   5.35                                                                             224.4                                     56.0/44.0    32.3  92.6  152.2   5.39                                                                             167.0                                     95.015.0     16.8  51.3  139.7   5.64                                                                             96.4                                      HFC-143/isobutane                                                              5.0/95.0    26.2  71.8  105.2   5.31                                                                             123.3                                     18.0/82.0    25.4  70.2  107.5   5.35                                                                             121.7                                     41.8/58.2    23.0  65.8  113.6   5.34                                                                             114.6                                     69.0/31.0    19.7  58.2  122.9   5.48                                                                             104.7                                     95.0/5.0     15.4  47.6  133.3   5.60                                                                             88.3                                      HFC-143/propane                                                                1.0/99.0    76.8  185.7 114.1   5.08                                                                             299.0                                     16.3/83.7    65.4  166.9 121.1   5.01                                                                             268.4                                     54.0/46.0    39.9  115.9 139.4   5.04                                                                             190.9                                     95.0/5.0     18.3  55.1  139.7   5.74                                                                             104.9                                     __________________________________________________________________________

The novel compositions of this invention, including the azeotropic orazeotrope-like compositions, may be used to produce refrigeration bycondensing the compositions and thereafter evaporating the condensate inthe vicinity of a body to be cooled. The novel compositions may also beused to produce heat by condensing the refrigerant in the vicinity ofthe body to be heated and thereafter evaporating the refrigerant.

In addition to refrigeration applications, the novel constant boiling orsubstantially constant boiling compositions of the invention are alsouseful as aerosol propellants, heat transfer media, gaseous dielectrics,fire extinguishing agents, expansion agents for polyolefins andpolyurethanes and power cycle working fluids.

EXAMPLE 5

This Example is directed to measurements of the liquid/vapor equilibriumcurves for the following mixtures of this invention, all at 25° C.:HFC-143/(CF₃)₂ NF; HFC-143/(CF₃)₃ N; HFC-143/N(CHF₂)₂ (CF₃);HFC-143/N(CH₂ F)(CF₃)₂ ; HFC-143/SF₅ CF₂ H; HFC-143/SF₅ C₂ F₅ ;HFC-143/HFC-236ca; HFC-143/HFC-236cb; HFC-143/HFC-254cb;HFC-143/HFC-254eb; HFC-143/HFC-263fb; HFC-143/HFC-272ca;HFC-143/HFC-281ea; HFC-143/HFC-281fa; HFC-143/4310mee; HFC-143/butane;HFC-143/cyclopropane; HFC-143/isobutane; and HFC-143/propane. Theliquid/vapor equilibrium data for these mixtures are shown in graphicalform in FIGS. 1-19.

The upper curve in FIG. 1 represents the composition of the liquid, andthe lower curve in FIG. 1 represents the composition of the vapor.

The data for the compositions of the liquid in FIG. 1 are obtained asfollows. A stainless steel cylinder is evacuated, and a weighed amountof HFC-143 is added to the cylinder. The cylinder is cooled to reducethe vapor pressure of HFC-143, and then a weighed amount of (CF₃)₂ NF isadded to the cylinder. The cylinder is agitated to mix the HFC-143 and(CF₃)₂ NF, and then the cylinder is placed in a constant temperaturebath until the temperature comes to equilibrium, at which time the vaporpressure of the HFC-143 and (CF₃)₂ NF in the cylinder is measured.Additional samples of liquid are measured the same way, and the resultsare plotted in FIG. 1.

The curve which shows the composition of the vapor is calculated usingan ideal gas equation of state.

Data are obtained in the same way for mixtures of HFC-143/(CF₃)₃ N;HFC-143/N(CHF₂)₂ (CF₃); HFC-143/N(CH₂ F)(CF₃)₂ ; HFC-143/SF₅ CF₂ H;HFC-143/SF₅ C₂ F₅ ; HFC-143/HFC-236ca; HFC-143/HFC-236cb;HFC-143/HFC-254cb; HFC-143/HFC-254eb; HFC-143/HFC-263fb;HFC-143/HFC-272ca; HFC-143/HFC-281ea; HFC-143/HFC-281fa;HFC-143/4310mee; HFC-143/butane; HFC-143/cyclopropane;HFC-143/isobutane; and HFC-143/propane at 25° C., and the results areplotted in FIGS. 2-19.

Except for FIG. 7, the data in FIGS. 1-19 show that at 25° C., there areranges of compositions that have vapor pressures higher or lower thanthe vapor pressures of the pure components of the composition at thatsame temperature. As stated earlier, the higher or lower than expectedpressures of these compositions result in an unexpected increase of therefrigeration capacity and efficiency for these compositions versus thepure components of the compositions.

EXAMPLE 6

This Example is directed to measurements of the liquid/vapor equilibriumcurve for mixtures of HFC-143 and HFC-236ea. The liquid/vaporequilibrium data for these mixtures are shown in FIG. 20. The uppercurve represents the liquid composition, and the lower curve representsthe vapor composition.

The procedure for measuring the composition of the liquid for mixturesof HFC-143 and HFC-236ea in FIG. 20 was as follows. A stainless steelcylinder was evacuated, and a weighed amount of HFC-143 was added to thecylinder. The cylinder was cooled to reduce the vapor pressure ofHFC-143, and then a weighed amount of HFC-236ea was added to thecylinder. The cylinder was agitated to mix the HFC-143 and HFC-236ea,and then the cylinder was placed in a constant temperature bath untilthe temperature came to equilibrium at 18.43° C., at which time thevapor pressure of the content of the cylinder was measured. Samples ofthe liquid in the cylinder were taken and analyzed, and the results areplotted in FIG. 20 as asterisks, with a best fit curve having been drawnthrough the asterisks.

This procedure was repeated for various mixtures of HFC-143 andHFC-236ea as indicated in FIG. 20.

The curve which shows the composition of the vapor is calculated usingan ideal gas equation of state.

The data in FIG. 20 show that at 18.43° C., there are ranges ofcompositions that have vapor pressures higher than the vapor pressuresof the pure components of the composition at that same temperature.

The novel compositions of this invention, including the azeotropic orazeotrope-like compositions, may be used to produce refrigeration bycondensing the compositions and thereafter evaporating the condensate inthe vicinity of a body to be cooled. The novel compositions may also beused to produce heat by condensing the refrigerant in the vicinity ofthe body to be heated and thereafter evaporating the refrigerant.

In addition to refrigeration applications, the novel constant boiling orsubstantially constant boiling compositions of the invention are alsouseful as aerosol propellants, heat transfer media, gaseous dielectrics,fire extinguishing agents, expansion agents for polyolefins andpolyurethanes and power cycle working fluids.

ADDITIONAL COMPOUNDS

Other components, such as aliphatic hydrocarbons having a boiling pointof -60° to +60° C., hydrofluorocarbonalkanes having a boiling point of-60° to +60° C., hydrofluoropropanes having a boiling point of between-60° to +60° C., hydrocarbon esters having a boiling point between -60°to +60° C., hydrochlorofluorocarbons having a boiling point between -60°to +60° C., hydrofluorocarbons having a boiling point of -60° to +60°C., hydrochlorocarbons having a boiling point between -60° to +60° C.,chlorocarbons and perfluorinated compounds, can be added to theazeotropic or azeotrope-like compositions described above withoutsubstantially changing the properties thereof, including the constantboiling behavior, of the compositions.

Additives such as lubricants, corrosion inhibitors, surfactants,stabilizers, dyes and other appropriate materials may be added to thenovel compositions of the invention for a variety of purposes providedthey do not have an adverse influence on the composition for itsintended application. Preferred lubricants include esters having amolecular weight greater than 250.

What is claimed is:
 1. A composition consisting essentially of anazeotropic or azeotrope-like composition consisting of 1-99 weightpercent 1,1,2-trifluoroethane and 99-1 weight percent of ahexafluoropropane selected from the group consisting of1,1,2,2,3,3-hexafluoropropane, 1,1,1,2,2,3-hexafluoropropane and1,1,2,3,3,3-hexafluoropropane wherein when the temperature has beenadjusted to about 25° C., said composition has an initial vapor pressureof about 24.9 to about 33.3 psia, and, the vapor pressure of saidcomposition changes no more than 3 percent after 50 percent of theinitial composition has been evaporated.
 2. A process for producingrefrigeration, comprising condensing a composition of claim 1 andthereafter evaporating said composition in the vicinity of the body tobe cooled.
 3. A process for producing heat, comprising condensing acomposition of claim 1 in the vicinity of a body to be heated, andthereafter evaporating said composition.